02-16-2019, 07:05 AM | #1 |
Drives: 2018 Camaro ZL1, 2017 Z06/Z07 Join Date: Jan 2019
Location: Burns, TN
Posts: 99
|
1 7/8" vs. 2" Kooks LTH
At what power level would be break even point where using the 2" header over the 1 7/8" Kooks header? I currently have the 1 7/8" Kooks installed, but have to take my car back down to Vengeance Racing next month for some updates and am wondering if it would be worth it to have them swap out my 1 7/8" headers for a set of 2" headers while it is there and being tuned. I am curious if anyone has done back to back testing at the 850 hp mark to see if there is any significant, real world gains in going to the larger diameter header. I know I will give up a little boost, but that could be addressed easily enough if it was enough boost to worry about. I have always believed that boosted engines like bigger exhaust, but I would like some real world feedback if it would be worth the effort in this specific combination. I am also curious if there are any issues with rubbing/clearance issues on the 2" headers as compared to the 1 7/8.
__________________
___________________________________________
2018 ZL1, Kong Ported LT4 SC, Kooks 2" Headers and X-Pipe, NW103mm TB, ATI Underdrive Pulley 673/688, 2017 Z06/Z07, Kong Ported LT4 SC, Kooks 2" Headers and X-Pipe, NW103mm TB, IW 18% Underdrive Pulley 640/664, 2019 Mustang GT Perf Pkg. 1 |
02-16-2019, 07:51 AM | #2 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
|
I'm running 1 7/8 BBK coated with high flow cats. Haven't been on the dyno yet but should be at 800 to 825 on 10-11 lbs of boost on E or race fuel. Staying with lower boost this year, old motor didn't like 16 lbs.
__________________
2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
|
02-16-2019, 08:13 AM | #3 |
Drives: 16' Camaro 2SS Join Date: Sep 2015
Location: Oregon
Posts: 381
|
At no point is it NOT worth going with 2” headers. Been proven time and time again you wont lose power anywhere and will only gain. I have had TSP 2” headers since my first round of mods and on extremely hard right hand turns you can occassionally hear a slight rub. That should be able to be adjusted with a slight tweak to the steering knuckle.
__________________
@DeathWatchCamaro on Insta
993whp Magnuson 2.3R 9.5 @ 145, Magnuson 2300, Full Weight 2SS, 17’s (810whp) |
02-16-2019, 08:41 AM | #4 | |
Drives: 2018 Audi TT RS Join Date: Jan 2014
Location: Navarre, Florida
Posts: 1,915
|
Quote:
__________________
2018 Audi TT ▊RS
2.4X 0-60, 1.6X 60', 120+mph 1/8th, 4.XX 60-130, 150+mph traps on 255/35/18 R888R tires on the street (unprepped). 2019 Audi RS3 About as fast as the TT RS 2019 Camaro ZL1 1LE Sold 2018 Camaro SS 1LE Sold 2019 Corvette Z06 Sold 2021 Charger Hellcat Redeye Widebody Sold |
|
02-16-2019, 08:43 AM | #5 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
|
I'm good with my choice and yes the 2" will make a little more power but I should have plenty to go where I'm planning.
__________________
2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
|
02-16-2019, 05:08 PM | #6 |
Drives: SS 6 speed of course Join Date: Jan 2016
Location: Hilo, HI
Posts: 4,316
|
I like the clearance etc from the smaller header, but as stated at no point will the small header be "better" in the power making department. I had to upgrade to 2" because my goal is to make 709 WHP with the LEAST boost possible. I could not leave the 15 HP difference on the table (1 PSI).
__________________
Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
|
02-27-2019, 05:12 AM | #7 | |
Drives: 2017 Camaro 2SS Nightfall Gray vert Join Date: Jan 2018
Location: Swansea, IL
Posts: 1,219
|
Quote:
__________________
2017 Camaro 2SS vert - Nightfall Gray
Magnuson Heartbeat SC - Tuned by JRE Racing 776whp/745wtq (12psi) 2018 Corvette Z06 vert- Black To be tuned by JRE Racing TBD performance |
|
02-27-2019, 11:41 AM | #8 |
Drives: 2017 Camaro 1SS M6 Whipple SC Join Date: Nov 2018
Location: Mesa, Arizona
Posts: 20
|
Boost is a measure of restriction. Just because you get a bigger exhaust or port your heads and boost drops does not mean a loss in power.
|
02-27-2019, 01:43 PM | #9 |
Drives: Camaro Join Date: Sep 2018
Location: USA
Posts: 520
|
My 434ci engine made over 800h.p. with 1-7/8 headers on the dyno, started with 2" headers & lost over 20h.p. The dyno shop was very suprised & we told them 1-7/8" would make more power. My engine builder & I were just smiling after the dyno pull.
|
02-27-2019, 01:51 PM | #10 |
Drives: 2018 SS 1LE Join Date: May 2018
Location: Arizona
Posts: 292
|
2” was proven to not lose power and gain a little torque comparing cars with the same mods at the shop. I can’t speak for others experiences...
Plus with all the random Dyno graphs I see posted showing 500hp with a few bolt on’s to the tires gets me too, no consistency in Dyno load, correction factors, etc. I wonder if people realize the changes that can be made on a Dyno to spit out a fantastic #
__________________
🌽 Sauced, 2018 SS 1LE - 123mph @ 5,000 DA
ARH 2”x3” FULL System, Pray Ported MSD Intake Manifold, Pray Ported GM 95mm TB, RotoFab CAI, DsX e85 Kit, MightyMouse Catch Can, NicD Tune https://instagram.com/corn_sauced?ut...d=o0ako89uurwl |
|
|
Post Reply
|
|
|